Showing papers in "Energy Conversion and Management in 2005"

TL;DR: In this article, the authors examined the energy use patterns and energy input-output analysis of some field crops (wheat, cotton, maize, sesame) and vegetables (tomato, melon, watermelon) widely grown in the Antalya region, which is one of the most important agricultural centres in Turkey.

TL;DR: In this paper, the melting process inside an irregular geometry filled with high thermal conductivity porous matrix saturated with phase change material PCM is investigated numerically, and the numerical model is resting on solving the volume averaged conservation equations for mass, momentum and energy with phase changing (melting) in the porous medium.

TL;DR: In this paper, a support vector machine with simulated annealing (SVMSA) model was proposed to forecast the electricity load in Taiwan, which outperformed the other two models, namely the autoregressive integrated moving average (ARIMA) model and the general regression neural networks (GRNN) model.

TL;DR: Clathrate hydrates are well known structures that were considered for many years as harmful by the oil and gas industry because of their annoying tendency to plug pipelines as mentioned in this paper, but they are now attracting renewed interest in many fields.

TL;DR: In this paper, the authors present a method of decomposing the flow sheet that assists in converging the process flow sheet and in optimizing key process operating variables, in particular the amine loadings and temperature of MEA entering the stripper.

TL;DR: In this paper, a methyl ester biodiesel was produced from a hazelnut soapstock/waste sunflower oil mixture using methanol, sulphuric acid and sodium hydroxide in a two stage process.

TL;DR: In this article, the technical performance and energy requirements for production and transportation of a stand-alone photovoltaic (PV)-battery system at different operating conditions are presented.

TL;DR: In this article, seasonal variations of the wind characteristics and wind turbine characteristics in the regions around Elazig, namely Maden, Agin and Keban, were analyzed for the six year period 1998-2003.

TL;DR: In this paper, the dynamics of CH 4 replacement in the CH 4 hydrate with saturated liquid CO 2 at 273.2 K was measured with a high pressure optical cell, and the results showed that CH 4 in the hydrate gradually moved to the liquid CO2 phase while CO 2 in the liquid phase penetrated into the hydrates from quantitative analysis.

TL;DR: In this paper, an experimental study on the performance and exhaust emissions of a turbocharged indirect injection diesel engine fuelled with tobacco seed oil methyl ester was performed at full and partial loads.

TL;DR: In this article, the authors evaluated the energy efficiency of biomass gasification, basing their work on data of the literature, and showed that the efficiency from thermodynamic calculation reaches 60% when considering hydrogen, carbon monoxide and methane as valuable species in the ideal case.

TL;DR: In this article, a study on the mathematical modelling of bay leaves is presented, where 15 different mathematical drying models were compared based on their correlation coefficient, root mean square error, mean bias error, reduced chi-square and t -statistic method to estimate the drying curves.

TL;DR: In this paper, an energy audit analysis of a dry type rotary kiln system working in a cement plant in Turkey was conducted and it was found that about 40% of the total input energy was being lost through hot flue gas (19.15%), cooler stack (5.61%), and kiln shell (15.11% convection plus radiation).

TL;DR: In this article, the authors examine possible niche markets in the cement and steel industries where it is possible to generate a limited supply of negative emissions (carbon storage or sequestration) cost-effectively.

TL;DR: In this paper, a thermoelectric generator was fitted to the side of a domestic woodstove to provide power at a reasonable cost, and the generator was air cooled by natural convection using a commercially available heat sink.

TL;DR: In this paper, the advantages of photovoltaic/thermal (PV/T) collectors and low-solar concentration technologies are combined into a PV/T system to increase the solar energy conversion efficiency.

TL;DR: In this paper, the Danish experience with methodologies and software tools, which have been used to design investment and operation strategies for almost all small CHP plants in Denmark during the decade of the triple tariff, is presented and discussed.

TL;DR: In this article, the authors used the relative duration of sunshine as a single independent variable to estimate the monthly average daily global radiation in areas where the radiation data is missing or not available, so that a geographical distribution of global solar radiation across the country may be obtained.

TL;DR: In this article, a fuzzy application to the area of load-frequency control (LFC) using fuzzy gain scheduling of PI controllers is presented, where variable values for the proportional and integral gains in the controller unit are used to improve dynamic performance of the system.

TL;DR: In this article, a seasonal thermal energy storage using paraffin wax as a PCM with the latent heat storage technique was attempted to heat the greenhouse of 180 m2 floor area.

TL;DR: In this article, several strategies are tested via compositional reservoir simulation to find injection and production procedures that “cooptimize” oil recovery and CO2 storage, and the results show that traditional reservoir engineering techniques such as injecting CO2 and water in sequential fashion, a so-called water-alternating-gas process, are not conducive to maximizing the CO2 stored within the reservoir.

TL;DR: In this article, the performances of four IGCC plants employing Shell, Texaco, BGL and KRW gasifiers were simulated using ASPEN Plus software for three different feeds.

TL;DR: In this paper, the authors used the Anderson-Darling test to estimate the Weibull scale and shape parameters of the wind speed probability density distribution and its standard errors and showed that the use of autocorrelated successive hourly mean wind speeds, though invalidating all of the usual statistical tests, has no appreciable effect on the shape of the probability density distributions.

TL;DR: In this article, the authors investigate the engine performance and the road performance of biodiesel fuel originated from used cooking oil in a Renault Megane automobile and four stroke, four cylinder, F9Q732 code and 75 kW diesel engine in winter conditions for 7500 km road tests in urban and long distance traffic.

TL;DR: In this paper, the feasibility and feasibility of substituting calcination of carbonates with basalt is investigated using thermodynamic equilibrium calculations using HSC software and process modelling using Aspen Plus®.

TL;DR: In this paper, the problem of co-optimizing oil production and CO2 storage differs significantly from current gas injection practice due to the cost-benefit imbalance resulting from buying CO2 for enhanced oil recovery projects.

TL;DR: In this article, an experimental study on the application of hydrocarbon mixtures to replace HFC-134a in a domestic refrigerator is presented, where the consumed energy, compressor power and refrigerant temperature and pressure at the inlet and outlet of the compressor are recorded and analyzed as well as the distributions of temperature at various positions in the refrigerator.

TL;DR: A neural network model is presented for short term peak load forecasting, short term total load forecasting and medium term monthly load forecasting in power distribution systems and the suitability of the proposed approach is illustrated through an application to real load shapes from the Turkish Electricity Distribution Corporation in Nigde.

TL;DR: In this article, the energy return factors and overall energy efficiencies for a stand-alone photovoltaic (PV)-battery system are calculated for eight battery technologies: lithium-ion (nickel), sodium-sulphur, nickel-cadmium, nickel metal hydride, lead-acid, vanadium-redox, zinc-bromine and polysulphiide bromide.

TL;DR: A novel self-adaptive chaotic particle swarm optimization algorithm to solve the short term generation scheduling of a hydro-system better in a deregulated environment and shows the effectiveness and robustness of the proposed approach in comparison with the traditional particle Swarm optimization algorithm.